Observer, Where?

Some months ago I got one error with Oracle Data Guard and now I had time to review it again and write this article. Just to be clear since the begin, the discussion here it is not about the error itself, but about the circumstances that generated it.

The environment described here follow, at least, the most common best practices for DG by Oracle. Have 1 dedicated server for each one: Primary Database, Physical Standby Database and Observer. The primary and standby resides in different datacenters in different cities, dedicated network for interconnect between sites, protection mode was Maximum Availability and runs with Fast-Start Failover enabled (with 30 seconds for threshold). The version here is 12.2, but will be the same for 19c. So, nothing so bad in the environment, basic DG configuration trying to follow the best practices.

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Oracle e MAA – Artigo VIII – Fast-Start Failover

Depois de configurar o Broker, precisamos de um último passo para garantir que os requisitos básicos do MAA estejam contemplados. Nos últimos artigos passamos por alguns passos que provavelmente você não iria realizar em produção (e nem gostaria), fizemos o failover e o switchover (ambos com o broker – que configuramos aqui).

OITAVO ARTIGO

Neste artigo vamos configurar/adicionar ao ambiente a figura do Observer, será habilitado o Fast-Start Failover (FSFO) no Broker para permitir um monitoramento em tempo real do ambiente. Com isso, em uma eventual falha do ambiente primary o standby irá assumir o papel sem ser necessário executar qualquer comando.

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